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Why string objects are immutable?

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Expert in Java/J2ee technology

We cannot change the String object because String is immutable. Vice-versa is not the same. String is immutable because of the security. Sting is storing the data in String Pool which can be used by multiple reference of String object. So during creation of String it is searching in the Pool the value... read more
We cannot change the String object because String is immutable. Vice-versa is not the same. String is immutable because of the security. Sting is storing the data in String Pool which can be used by multiple reference of String object. So during creation of String it is searching in the Pool the value is present or not. If present object is pointing to the String. So multiple object can refer to single value. read less
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Computer Classes

String objects are immutable because of we can't change,if you try to alter their values, another object gets created
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12 years of MNC company work experience on java ,J2ee technologies

In java the string objects are immutable ,that we can't change the object value .It provides the security in java.Once we create and passed the parameter as string ,In between the components nobody modify the String objects.It gives the security in communication among components in distribution envir...
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Trainer

If the strings are not immutable, it would lead to serious security threat as it would allow to changes in the file containing it. Mutable strings could cause security problem in Reflection too, as the parameters in the methods being inspected are strings. Therefore in all these cases hashcode of the... read more
If the strings are not immutable, it would lead to serious security threat as it would allow to changes in the file containing it. Mutable strings could cause security problem in Reflection too, as the parameters in the methods being inspected are strings. Therefore in all these cases hashcode of the string is frequently used in Java to know if its value is changed knowingly or unknowingly. read less
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Tutor

Strings are immutable once created cannot be changed and hence cannot be eliminated but string builders are mutable.
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Expert in Java/J2ee technology

The string is Immutable because String objects are stored in String pool. String pool are shared between multiple clients there is always a risk to updating the data. When a string is created and if the string already exists in the pool, the reference of the existing string will be returned, instead... read more
The string is Immutable because String objects are stored in String pool. String pool are shared between multiple clients there is always a risk to updating the data. When a string is created and if the string already exists in the pool, the reference of the existing string will be returned, instead of creating a new object and returning its reference. read less
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Java Tutor

String class is made Immutable to provide more efficiency. Its not that all time new object is created , there is concept of String Pool which is used for look up the existing objects
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Trainer

Very good questions thanks for asasking The string is Immutable in Java because String objects are cached in String pool. Since cached String literals are shared between multiple clients there is always a risk, where one client's action would affect all another client. For example, if one client changes... read more
Very good questions thanks for asasking The string is Immutable in Java because String objects are cached in String pool. Since cached String literals are shared between multiple clients there is always a risk, where one client's action would affect all another client. For example, if one client changes the value of String "Test" to "TEST", all other clients will also see that value as explained in the first example. Since caching of String objects was important from performance reason this risk was avoided by making String class Immutable. read less
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Trainer

String is immutable cause of security parameters are typically represented as String in network connections, database connection urls, usernames/passwords etc. If it were mutable, these parameters could be easily changed. In Synchronization and concurrency making String immutable automatically makes... read more
String is immutable cause of security parameters are typically represented as String in network connections, database connection urls, usernames/passwords etc. If it were mutable, these parameters could be easily changed. In Synchronization and concurrency making String immutable automatically makes them thread safe thereby solving the synchronization issues. Caching: when compiler optimizes your String objects, it sees that if two objects have same value (a="test", and b="test") and thus you need only one string object (for both a and b, these two will point to the same object). Class loading: String is used as arguments for class loading. If mutable, it could result in wrong class being loaded (because mutable objects change their state). read less
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Trainer

In java, string objects are immutable. Immutable simply means unmodifiable or unchangeable. Once string object is created its data or state can't be changed but a new string object is created.
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